This picture was made with a radar. It shows the area around the North Pole of Mercury. There are some white circles or "doughnuts" in the picture. The white circles might be ice at the bottom of meteor craters. The picture is a few hundred kilometers across. It was made by the Arecibo radio telescope in Puerto Rico. Image courtesy of NAIC - Arecibo Observatory, a facility of the NSF (J. Harmon, P. Perrilat, and M. Slade).